CN1321104C - 1,3,6,8-tetra substituted pyrene compound, organic electroluminescent elements using the same compound, and organis electroluminescent display device - Google Patents

1,3,6,8-tetra substituted pyrene compound, organic electroluminescent elements using the same compound, and organis electroluminescent display device Download PDF

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CN1321104C
CN1321104C CNB031533035A CN03153303A CN1321104C CN 1321104 C CN1321104 C CN 1321104C CN B031533035 A CNB031533035 A CN B031533035A CN 03153303 A CN03153303 A CN 03153303A CN 1321104 C CN1321104 C CN 1321104C
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外山弥
佐藤博之
松浦东
成泽俊明
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Fujifilm Corp
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Abstract

The present invention aims to provide an organic EL element having excellent light-emitting efficiency, emission luminance and color purity of green light. The organic EL element contains an organic thin film layer interposed between a positive electrode and a negative electrode, this organic thin film layer comprising a 1,3,6,8-tetrasubstituted pyrene compound represented by the following formula (1) as a luminescent material: wherein R<1 >to R<4 >may be the same or different, and represent a group represented by the following formula (2): wherein R<5 >and R<6 >may be the same or different, and represent a hydrogen atom or a substituent group.

Description

1,3,6, the quaternary pyrene compound of 8-uses the organic electroluminescent device and the display of organic electroluminescence of this compound
The cross reference of related application
The application is on August 28th, 2002 with the applying date, and application number is that the Japan of No.2002-248378 is the basis in first to file, and requires its right of priority, and above-mentioned full content is incorporated into for your guidance in this.
Background of invention
Invention field
The present invention relates to a kind of being suitable for and in organic electroluminescent (EL) element, be used as 1,3,6 of luminescent material, the quaternary pyrene compound of 8-, comprise this 1,3,6,8-four replaces the organic EL of pyrene compounds, and the OLED display that comprises this organic EL.
Description of Related Art
Organic EL has as characteristics such as luminous, quick responses, and is expected to be applied in the flat-panel monitor.The existing report of two-layer (multilayer) organic EL (C.W.Tang and the S.A.VanSlyke that comprise organic film with hole migration performance (hole moving layer) and organic film with electronic migration performance (electron transfer layer), Applied Physics Letter, 51 volumes, 913 (1987)), and, as at 10 volts of low voltages or luminous large area light emitting element under the low voltage more, organic EL has caused people's attention recently.The laminated-type organic EL has the such basic structure of positive pole/hole moving layer/luminescent layer/electron transfer layer/negative pole, wherein the function of hole moving layer or electron transfer layer can be dissolved in the function of luminescent layer in two-layer type.
Recently, people estimate that organic EL will be applied to full-color display very soon.In full-color display, must have and can be distributed on the display panel, can send the pixel of indigo plant (B), green (G) and red (R) primaries.This there are three kinds of making methods, just, (a) provide the organic EL of three types of blue (B), green (G) and red (R); (b) separate the white light (this white light is the mixed light of blue (B), green (G), red (R)) that organic EL sends by colour filter; (c) blue light that organic EL is sent by the color conversion layer that uses fluorescence changes green (G) light and red (R) light into.
On the other hand, in order to obtain having the organic EL of high-luminous-efficiency, the pigment molecular that people have proposed to have on a small quantity high fluorescence adds as the luminescent layer (C.W.Tang that has high-luminous-efficiency in the material of main part of main raw with formation as guest materials, S.A.VanSlyke, andC.H.Chen, Journal of Applied Physics, vol.65,3610 (1989)).
Correlation technique does not provide the organic EL with high-luminous-efficiency.Therefore, make new high-performance organic EL and become demand.
Summary of the invention
Therefore the purpose of this invention is to provide a kind of 1 of luminescent material that is suitable in organic EL, being used as, 3,6,8-four replaces pyrene compound, a kind of organic EL and a kind of efficient OLED display of using this organic EL with fabulous luminous efficiency, luminosity and green light color purity.
The present invention specific 1,3,6, the quaternary pyrene compound of 8-is suitable for being used as the luminescent material of green light in organic EL, and use this 1,3,6, the quaternary pyrene compound of 8-has fabulous luminous efficiency, luminosity and green light color purity as the organic EL and the OLED display of luminescent material, and compares with correlation technique, has higher efficient and better properties.
Organic EL of the present invention comprises the organic thin film layer between positive pole and negative pole.In organic EL, organic thin film layer comprises by 1,3,6 of following formula (1) expression, and the quaternary pyrene compound of 8-is as luminescent material:
Figure C0315330300101
Formula (1)
R wherein 1To R 4Can be identical or different, represent the group of following formula (2) respectively:
Figure C0315330300102
Formula (2)
R wherein 5And R 6Can be identical or different, represent hydrogen atom or substituting group respectively.
Because organic EL of the present invention comprises 1,3,6, the quaternary pyrene compound of 8-is as luminescent material, thereby it has fabulous luminous efficiency, luminosity and green light color purity.
Of the present invention 1,3,6, the quaternary pyrene compound of 8-is represented by following formula (1):
Formula (1)
R wherein 1To R 4Can be identical or different, represent the group of following formula (2) respectively:
Formula (2)
R wherein 5And R 6Can be identical or different, represent the group of hydrogen atom or replacement respectively.
As the present invention 1,3,6, when the quaternary pyrene compound of 8-was used as luminescent material in organic EL, it showed excellent luminous efficiency, luminosity and green light color purity.
OLED display of the present invention is used organic EL of the present invention.Because OLED display of the present invention has been used organic EL of the present invention, thereby it has fabulous luminous efficiency, luminosity and green light color purity.
The accompanying drawing summary
Fig. 1 is a schematic cross-sectional view of describing organic EL layer structure example of the present invention.
Fig. 2 is a synoptic diagram of describing passive matrix method OLED display (passive matrix plate) structure example.
Fig. 3 is a synoptic diagram of describing practical circuit in the passive matrix method OLED display shown in Figure 2 (passive matrix plate).
Fig. 4 is a synoptic diagram of describing active matrix method OLED display (active matrix board) structure example.
Fig. 5 is a synoptic diagram of describing practical circuit in the active matrix method OLED display shown in Figure 4 (active matrix board).
Fig. 6 be describe synthesize 1,3,6, the figure of the IR spectrum example of 8-four [N-(1-aminomethyl phenyl)-N-phenyl amino] pyrene.
Fig. 7 be describe synthesize 1,3,6, the figure of the IR spectrum example of 8-four [N-(1-naphthyl)-N-phenyl amino] pyrene.
The description of preferred embodiment
<1,3,6, the quaternary pyrene compound of 8-〉
The present invention 1,3,6, and the quaternary pyrene compound of 8-is represented by following formula (1):
Figure C0315330300121
Formula (1)
In formula (1), R 1To R 4Can be identical or different, and represent the group of following formula (2) respectively:
Formula (2)
In formula (2), R 5And R 6Can be identical or different, and represent hydrogen atom or substituting group respectively.R 5And R 6Be not bonded to ring.
There is no particular restriction to substituting group, can select according to purpose.Substituent example comprises alkyl group, aromatic yl group or the like.They can further be substituted base and replace.There is no particular restriction to the above-mentioned substituent substituting group of further replacement.This substituent example can be selected from the known any substituting group of prior art.
There is no particular restriction to alkyl group, can select according to purpose.The example of alkyl group comprises straight chain, side chain or the cyclic alkyl group with 1 to 10 carbon atom.The special case of alkyl group has methyl, ethyl, propyl group, sec.-propyl, butyl, isobutyl-, the tertiary butyl, amyl group, isopentyl, hexyl, isohexyl, heptyl, different heptyl, octyl group, iso-octyl, nonyl, different nonyl, decyl, isodecyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, suberyl, ring octyl group, ring nonyl, ring decyl or the like.
There is no particular restriction to aromatic yl group, can select according to purpose.The example of aromatic yl group comprises the group with monocyclic aromatic rings, the be bonded together group that forms and have five or five following fused aromatic rings and the carbon that comprises, oxygen, nitrogen and sulphur atom add up to group below 50 or 50 of four or four following aromatic rings.
There is no particular restriction to monocyclic aromatic rings.Group with monocyclic aromatic rings can be selected according to purpose, and example comprises phenyl, tolyl, xylyl, cumyl, styryl, mesityl, cinnamyl, styroyl, diphenyl-methyl or the like.They can be substituted base and replace.
Four or four following aromatic rings are bonded together, and there is no particular restriction for the group that forms, and can select according to purpose.Four or four the following aromatic rings group example that forms that is bonded together comprises naphthyl, anthryl, phenanthryl, indenyl, Azulene base (azulenyl), benzo anthryl or the like.They can be substituted base and replace.
Add up to group below 50 or 50 there is no particular restriction having five or five following fused aromatic rings and the carbon that comprises, oxygen, nitrogen and sulphur atom, can select according to purpose.Above-mentioned examples of groups comprises pyrryl, furyl, thienyl, pyridyl, quinolyl, isoquinolyl, imidazolyl, pyridyl (pyridinyl), pyrrolopyridinyl, thiazolyl, pyrimidyl, thiophenyl, indyl, quinolyl (quinolinyl), pyrenyl, adeninyl or the like.They can be substituted base and replace.
R in the formula (1) 1To R 4(formula (2) is represented) is preferably following formula (3), formula (4) and formula
One of (5) represented group.
R in formula (1) 1To R 4(they are represented by formula (2) respectively) when being the group shown in the formula (3), 1,3,6, and the quaternary pyrene compound of 8-is 1,3,6,8-four (N, N-diphenyl amino) pyrene.Work as R 1To R 4When being the group shown in the formula (4), 1,3,6, the quaternary pyrene compound of 8-is 1,3,6,8-four [N-(1-naphthyl)-N-phenyl amino] pyrene.Work as R 1To R 4When being the represented group of formula (5), 1,3,6, the quaternary pyrene compound of 8-is 1,3,6,8-four [4,4 '-two (α, α '-dimethyl benzyl) diphenyl amino] pyrene
Formula (3)
In the formula (3), R 7And R 8Can be identical or different, and represent at least one hydrogen atom respectively, at least one alkyl group, or at least one aromatic yl group.Alkyl group and aromatic yl group can be above mentioned any groups.Letter " n " represents 1 or greater than 1 integer.
Figure C0315330300141
Formula (4)
In formula (4), R 9, R 10And R 11Can be identical or different, and represent at least one hydrogen atom respectively, at least one alkyl group, or at least one aromatic yl group.Alkyl group and aromatic yl group can be above-mentioned any groups.Letter " n " represents 1 or greater than 1 integer.
Figure C0315330300142
Formula (5)
In the formula (5), R 12, R 13, R 14And R 15Can be identical or different, and represent at least one hydrogen atom respectively, at least one alkyl group, or at least one aromatic yl group.Alkyl group and aromatic yl group can be any groups above-mentioned.Letter " n " represents 1 or greater than 1 integer.
For the present invention 1,3,6, there is no particular restriction for the manufacture method of the quaternary pyrene compound of 8-.
This method can suitably be selected according to purpose.Below provide an example of this method: at first, synthesize 1,3,6,8-four halogenated pyrenes by the reaction of pyrene and halogen.As Annalen der Chemie, 531 volumes, 81 pages are described, can carry out halogenating reaction by add single halogen species in the pyrene that is dissolved in solvent.The example of halogen comprises chlorine, bromine, iodine and analogue.These halogens are useful in the reaction of next stage.In the middle of them, in order to be easy to carry out preferred chlorine of halogenating reaction and bromine.Next, heating 1,3,6,8-four halogenated pyrenes and corresponding to the secondary amine of predetermined compound, and they are reacted in the presence of catalyzer and alkali, thus obtain the present invention 1,3,6, the quaternary pyrene compound of 8-.Catalyzer can be copper or copper compound, and for example copper powder, cuprous chloride and copper sulfate maybe can use palladium compound or analogue.Alkali is for example tert.-butoxy sodium of yellow soda ash, salt of wormwood, sodium hydroxide or sodium alkoxide.
When 1,3,6, when 8-four [N-(1-aminomethyl phenyl)-N-phenyl amino] pyrene was made by above-mentioned routine techniques, at first the reaction by pyrene and bromine obtained 1,3,6,8-tetrabromo pyrene.Next, according to as Tetrahedron Letters, 39 volumes, the ordinary method by the synthetic triarylamine of aryl halide described in 2367 pages (1998) makes 1,3,6, and 8-tetrabromo pyrene carries out the diaryl amination.Add 4 normal 3-methyldiphenyl base amine, 4 normal tert.-butoxy sodium, 0.1 normal acid chloride and 0.4 normal three (tertiary butyl) phosphine, and make they and 1,3,6,8-tetrabromo pyrene as in the o-Xylol of solvent in 130 ℃ of reactions 3 hours down.Wash reaction solution with water several times after the cooling, distill o-Xylol, remain oily matter with methanol wash, recrystallization goes out crude product from THF-methyl alcohol.Thereby then by vacuum-sublimation purification crude product obtain being scheduled to 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
The present invention 1,3,6, and the quaternary pyrene compound of 8-can be used for various fields, and is particularly suitable for as the luminescent material in the organic EL.When of the present invention 1,3,6, when the quaternary pyrene compound of 8-is used as luminescent material in organic EL, can transmitting green light.
<organic EL 〉
Organic EL of the present invention comprises the organic thin film layer that is inserted between positive pole and the negative pole.It is of the present invention 1,3,6 that this organic thin film layer comprises, the quaternary pyrene compound of 8-.That is to say that organic EL of the present invention comprises by 1,3,6 of aforementioned formula (1) expression, the quaternary pyrene compound of 8-is as luminescent material.
As mentioned above, R in the formula (1) 1To R 4(group shown in the formula (2)) is preferably by the group shown in any in formula (3), formula (4) and the formula (5).
In the present invention, 1,3,6, the quaternary pyrene compound of 8-is included in the organic thin film layer as luminescent material, and it also can be included in the luminescent layer of organic thin film layer, luminous and electron transfer layer, luminous and hole moving layer or the like.When 1,3,6, when the quaternary pyrene compound of 8-was included in the luminescent layer, this luminescent layer can be only to comprise 1,3,6, the film of the quaternary pyrene compound of 8-, or remove 1,3,6, also contain the film of other material outside the quaternary pyrene compound of 8-.
In the present invention, preferably, luminescent layer in the organic thin film layer, luminous and electron transfer layer, luminous and hole moving layer or the like comprise as of the present invention 1 of guest materials, 3,6, the quaternary pyrene compound of 8-, and except that guest materials, also comprise material of main part, the emission wavelength of this material of main part approaches the light absorption wavelength of guest materials.Material of main part preferably is contained in the luminescent layer, and also can be included in hole moving layer, electron transfer layer or the like.
When aforementioned guest materials and material of main part are used in combination,, then at first excite material of main part if it is luminous to produce organic EL.Because the emission wavelength and the guest materials (1 of material of main part, 3,6, the quaternary pyrene compound of 8-) absorbing wavelength (330-500nm) is overlapping, excitation energy is transferred to guest materials from material of main part effectively, and material of main part turns back to ground state and be not luminous, and the guest materials of only moving to excited state discharges excitation energy with the form of green glow, therefore, luminous efficiency, luminosity and green light color purity are fabulous.
Usually, if have only a kind of light emitting molecule to be present in the film or multiple molecule is contained in the film with high density with high density, then light emitting molecule so near so that interact, acts on so so-called " quencher of concentrating " occurred to each other, has caused luminous efficiency decline.But, when guest materials and material of main part used together, as 1,3,6 of guest compound, the quaternary pyrene compound of 8-was dispersed in the host compound with relatively low concentration.Therefore, effectively suppressed this " quencher of concentrating " effect, so obtain fabulous luminous efficiency.Therefore to be used in combination be favourable to two kinds of materials.And by guest materials and material of main part one are used from luminescent layer, because material of main part has excellent film forming properties usually, thereby binding substances has excellent film forming properties and has kept luminescent properties simultaneously.
There is no particular restriction to material of main part, can suitably select according to purpose.Emission wavelength preferably approaches the light absorption wavelength of guest materials.The example of material of main part comprises the aromatic amine derivative by following formula (6) expression, the carbazole derivative of through type (8) expression, oxine (oxine) title complex of through type (10) expression, 1 of through type (21) expression, 3,6,8-tetraphenyl pyrene compound, 4 of through type (14) expression, 4 '-(2,2 '-diphenylacetylene)-1,1 '-biphenyl (DPVBi) (main emission wavelength=470nm), right-the sexiphenyl (p-sexiphenyl) of through type (15) expression (main emission wavelength=400nm) and through type (16) represent 9,9 '-dianthranide (bianthryl) (main emission wavelength=460nm).
Formula (6)
In formula (6), " n " represents integer 2 or 3, and Ar represents divalence or trivalent aromatic group and divalence or trivalent heterocyclic aromatic group, R 16And R 17Can identical or different and expression unit price aromatic group or heterocyclic aromatic group.There is no particular restriction to this aromatic group or heterocyclic aromatic group, and they can be selected according to purpose.
In the middle of the aromatic amine derivative shown in the formula (6), the N shown in the preferred following formula (7), N '-dinaphthyl-N, N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines (NPD) (main emission wavelength=430nm) and derivative thereof.
Figure C0315330300172
Formula (7)
Formula (8)
In formula (8), Ar is divalence or the trivalent group that comprises following listed aromatic ring, or comprises the divalence or the trivalent group of heterocycle aromatic ring:
Figure C0315330300181
They can be replaced by nonconjugated group.R is the represented connection base of following formula for example,
Figure C0315330300182
In formula (8), R 18And R 19Represent hydrogen atom, halogen atom, alkyl group, aromatic alkyl group, kiki alkenyl group, aromatic yl group, cyano group, amino group, carboxyl groups, alkoxycarbonyl groups, carboxylic group, alkoxy base, alkyl sulphonyl group, oh group, amide group, aryloxy group, aromatic hydrocarbon ring or aromatic heterocyclic group respectively.They can further be substituted base and replace.
In formula (8), " n " be integer 2 or 3 preferably.
In the middle of the aromatic amine derivative shown in the formula (8), because You Yi luminous efficiency, luminosity and purity of color especially, preferred such compound and derivative thereof, wherein Ar is that phenyl ring connects R in aromatic group and this aromatic group with singly-bound 18And R 19Being hydrogen atom and n=2, also is 4,4 ' shown in the following formula (9)-two (9-carbazyl)-biphenyl (CBP) (main emission wavelengths=380nm).
Figure C0315330300191
Formula (9)
Figure C0315330300192
Formula (10)
Wherein " M " represents atoms metal, R 20Expression hydrogen atom, halogen atom, alkyl group, aromatic alkyl group, kiki alkenyl group, aromatic yl group, cyano group, amino group, carboxyl groups, alkoxycarbonyl groups, carboxylic group, alkoxy base, alkyl sulphonyl group, oh group, amide group, aryloxy group, aromatic hydrocarbon ring or aromatic heterocyclic group.They can further be substituted base and replace.
In the oxine title complex shown in the formula (10), and the aluminium quinoline title complex (Alq) shown in the preferred following formula (11) (main emission wavelength=530nm).
Figure C0315330300193
Formula (11)
Figure C0315330300194
Formula (21)
R wherein 21To R 24Can be identical or different, and represent hydrogen atom or substituting group respectively.This substituting group for example can be alkyl group, group of naphthene base or aromatic yl group, and they can further be substituted basic the replacement.
In 1,3,6 shown in the formula (21), in the 8-tetraphenyl pyrene class, consider excellent luminous efficiency, luminosity and purity of color, preferred R 21To R 24Be hydrogen atom, i.e. 1,3,6 shown in the formula (13), 8-tetraphenyl pyrene (main emission wavelength=440nm).
1,3,6,8-tetraphenyl pyrene formula (13)
Figure C0315330300202
To six biphenyl formulas (15)
9,9 '-dinaphthyl formula (16)
Comprising shown in the formula (1) 1,3,6, in the layer of the quaternary pyrene compound of 8-, this 1,3,6, the amount of the quaternary pyrene compound of 8-is preferably 0.1% to 50% by percentage to the quality, more preferably 0.5% to 20%.
If mass percentage content is less than 0.1%, then luminous efficiency, luminosity and purity of color may be not enough.If its quality percentage composition is greater than 50%, purity of color variation then.On the contrary, if its amount falls into preferable range, then luminous efficiency, luminosity and purity of color are fabulous.
When applying electric field, if the luminescent layer in the organic EL of the present invention can be from aforementioned positive pole, hole injection layer, aforementioned hole moving layer etc. hole injection, and from aforementioned negative pole, electron injecting layer, aforementioned electronic migrating layer etc. electron injection; The position of hole and electron recombination is provided; And have and make luminous 1,3,6, the quaternary pyrene compound of 8-(luminescent material, light emitting molecule) is by the reorganization energy that produces in when reorganization and the function of green light, and then luminescent layer can comprise and a kind ofly removes 1,3,6, the luminescent material outside the quaternary pyrene compound of 8-is not as long as it can influence the emission of green glow.
Aforementioned light emission layer can be made according to any currently known methods.These method examples comprise that vapor deposition method, wet type become embrane method, molecular beam oriented growth (molecular beam epitaxy method) (MBE) method, ion beam method (cluster ion beam menthod), molecular layer legal (molecule laminating method), Langmuir-Brodgett (LB) method, print process (printing method), transfer method (transfer method) or the like.
Wherein, consider the liquid waste disposal problem with an organic solvent and not occur, and can produce luminescent layer, therefore preferred vapor deposition method cheap, easily and effectively.When forming single layer structure, for example form hole migration and luminous and electron transfer layer, also preferably wet type becomes embrane method.
There is no particular restriction to vapor deposition method, can suitably select known method according to purpose.The example of vapor deposition method comprises vacuum gas deposition, resistive heating gas deposition, chemical vapor deposition, physical vapor deposition or the like.The example of chemical vapor deposition method comprises plasma CVD, laser CVD, hot CVD, gas source CVD or the like.Luminescent layer can be by for example 1,3,6, and the vacuum gas deposition of the quaternary pyrene compound of 8-forms.When luminescent layer comprises material of main part and 1,3,6, during the quaternary pyrene compound of 8-, can make material of main part and 1,3,6 by the vacuum gas deposition, the quaternary pyrene compound of 8-deposits simultaneously and forms luminescent layer.From need not the viewpoint of codeposition, when not containing material of main part, be easier to make luminescent layer.
Aforementioned wet type is become embrane method, and there is no particular restriction, can suitably select known method according to purpose.Wet type becomes the example of embrane method to comprise that ink jet method (ink-jet method), spin-coating method, kneading coating process, rod are coated with method, spread coating, casting method (casting method), dip coating method, curtain coating method or the like.
In aforementioned wet type film, can use the material of (applying or similar approach) luminescent layer to dissolve and be scattered in wherein solution with resin Composition.The example of resin Composition comprises Polyvinyl carbazole, polycarbonate, polyvinyl chloride, polystyrene, polymethylmethacrylate, polyester, polysulfones, polyphenylene oxide, polyhutadiene, hydrocarbon resin, ketone resin, phenoxy resin, polymeric amide, ethyl cellulose, vinyl acetate, acrylonitrile butadiene styrene resin (ABS), urethane, melamine resin, unsaturated polyester resin, Synolac, Resins, epoxy, silicone resin or the like.
When preparing luminescent layer by the wet type film, can be by for example coating and drying 1,3,6, the solution (coating solution) that quaternary pyrene compound of 8-and resin material (if necessary) are dissolved in the solvent forms luminescent layer.If also comprising, luminescent layer removes 1,3,6, the material of main part that the quaternary pyrene compound of 8-is outer then can be by coating and dry 1,3,6, the solution (coating solution) that the quaternary pyrene compound of 8-, material of main part and resin (if necessary) are dissolved in the solvent is implemented the wet type film.
The thickness of aforementioned light emission layer is preferably 1 nanometer to 50 nanometer, more preferably 3 nanometer to 20 nanometers.
If the thickness of luminescent layer is 1 nanometer to 50 nanometer, then luminous efficiency, luminosity and the purity of color of the light that sends of organic EL are enough.If thickness is 3 nanometer to 20 nanometers, these effects are more remarkable.
Organic EL of the present invention comprises organic thin film layer, and this organic thin film layer comprises the luminescent layer between positive pole and negative pole.Organic EL of the present invention also can comprise other layer for example protective layer or analogue according to purpose.
Organic thin film layer comprises aforementioned light emission layer, and if necessary, also can comprise hole injection layer, hole moving layer, hole blocking layer or electron transfer layer.
-anodal-
There is no particular restriction to positive pole, can suitably select according to purpose.Specifically, when organic thin film layer only comprised luminescent layer, preferred positive pole provided hole (carrier) to luminescent layer.When organic thin film layer also comprised hole moving layer except that luminescent layer, preferred positive pole provided hole (carrier) to hole moving layer.When organic thin film layer also comprised hole injection layer, preferred positive pole provided hole (carrier) to hole injection layer.
There is no particular restriction to positive electrode material, can suitably select according to purpose.The example of material comprises metal, alloy, metal oxide, conductive compound, their mixture or the like.Wherein, the material with 4eV or bigger work function is preferred.
The special case of positive electrode material comprises conductive metal oxide, as stannic oxide, zinc oxide, Indium sesquioxide, tin indium oxide (ITO) or analogue; Metals like gold, silver, chromium, nickel or analogue; The mixture of these metals and conducting metal oxide or multilayered structure; The inorganic conductive material is cupric iodide and cupric sulfide for example, organic conductive material such as polyaniline, Polythiophene and polypyrrole, and the multilayered structure of they and ITO, or the like.They can use separately, also can two or more be used in combination.Wherein, consider throughput, high conductivity and the transparency, preferred conducting metal oxide, preferred especially ITO.
There is no particular restriction to anodal thickness, can wait according to material and select.Preferred 1 nanometer to 5000 nanometer of thickness, more preferably 20 nanometer to 200 nanometers.
Positive pole forms on such as matrix such as glass, soda-lime glass, non-alkali glass, transparent resins usually.
When using above-mentioned glass, consider that they can reduce from the ion of glass migration preferred non-alkali glass or soda-lime glass as matrix.
There is no particular restriction to the thickness of matrix, as long as it has enough physical strengths.Yet if use glass as matrix, thickness is more than or equal to 0.2 millimeter usually, is preferably greater than or equals 0.7 millimeter.
Can make positive pole easily by currently known methods, for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal to these methods, Langmuir-brodgett (LB) method, print process, transfer method and apply the method for ITO dispersion by chemical reaction method (sol-gel method or similar approach).
By washing anodal and implementing other and handle, can reduce the driving voltage of organic EL, can also improve luminous efficiency.If positive electrode material is ITO, the example of other processing comprises UV ozonize and plasma process and similar approach.
-negative pole-
There is no particular restriction for anticathode, can suitably select according to purpose.Preferably anode provides hole (carrier) to organic thin film layer, especially when only comprising luminescent layer, organic thin film layer provides hole (carrier), or when organic thin film layer also comprises electron transfer layer except that luminescent layer, preferably provide electronics to this electron transfer layer to luminescent layer.When between organic thin film layer and the negative pole electron injecting layer being arranged, preferred negative pole provides electronics to this electron injecting layer.
There is no particular restriction for the material of anticathode.Can and be close to the layer of this negative pole or the bond properties between the molecule (for example electron transfer layer and luminescent layer) according to negative pole, and suitably select this material according to ionization potential and stability.The example of material comprises metal, alloy, metal oxide, conductive compound, their mixture or the like.
The specific examples of negative material comprises basic metal (for example Li, Na, K, Cs), alkaline-earth metal (for example Mg, Ca), gold, silver, lead, aluminium, sodium-potassium-sodium alloy or its mixture, lithium-aluminium alloy or its mixture, magnesium-silver alloys or its mixture, rare earth metal is indium and ytterbium for example, and their alloy.
They can use separately or two or more are used in combination.Wherein, preferred work function (work function) is less than or equal to the material of 4eV.More preferably aluminium, lithium-aluminium alloy or its mixture, perhaps magnesium-silver alloys or its mixture.
There is no particular restriction for the thickness of anticathode, can select according to the material of negative pole.Thickness is preferably 1 nanometer to 10000 nanometer, more preferably 20 nanometer to 200 nanometers.
Can make negative pole easily by currently known methods, for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal to these methods, Langmuir-brodgett (LB) method, print process, transfer method or the like.
When two or more of these materials together when the negative material, described two or more materials are gas deposition simultaneously, thereby forms alloy electrode, perhaps with previously prepared alloy gas deposition, so that form alloy electrode.
The preferably lower value of resistance of positive pole and negative pole, and preferably they are no more than the hundreds of ohm-sq.
-hole injection layer-
There is no particular restriction to hole injection layer, can select according to purpose.Preferably, for example, when applying electric field, hole injection layer has the function of injection from the anodal hole.
There is no particular restriction to the material of hole injection layer, can select easily according to purpose, for example the asterism shape amine (starburst amine) shown in the following formula (4,4 ', 4 "-three [3-aminomethyl phenyl (phenyl) amino] triphenylamine: m-MTDATA), CuPc or polyaniline.
There is no particular restriction to the thickness of hole injection layer, and it can be selected according to purpose.Thickness is preferably 1 nanometer to 100 nanometer, more preferably 5 nanometer to 50 nanometers.
Can make hole injection layer easily by currently known methods, for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal, Langmuir-brodgett (LB) method, print process, transfer method or the like.
-hole moving layer-
There is no particular restriction to hole moving layer, can select according to purpose.Preferred hole moving layer example is to have the layer that transmits the function in hole from positive pole when applying electric field.
There is no particular restriction to the material of hole moving layer, can select easily according to purpose.Examples of materials comprises aromatic amines compound, carbazole, imidazoles, triazole oxazole , oxadiazole, the polyaryl paraffinic hydrocarbons, pyrazoline, pyrazolone, phenylenediamine, arylamines, the phenyl styryl ketone that amine replaces, the styryl anthracene, Fluorenone, hydrazone, stilbene, silazane, styryl amine, aromatic series two methene base (dimethylidene) compounds, porphyrine compound, the oligopolymer of conduction and polymkeric substance be polysilane (polisilane) compound, poly-(N-vinylcarbazole), aniline, thiophene oligomers and polymkeric substance, Polythiophene and carbon film for example.If the material mixing of the material of hole moving layer and luminescent layer and form film has then formed hole migration and luminescent layer.
These materials can use separately, and perhaps two or more materials can be used in combination.Wherein, optimization aromatic amine compound.The special case of aromatic amines compound comprises the TPD (N that following formula is represented, N '-phenylbenzene-N, N '-(two (3-aminomethyl phenyls)-[1,1 '-biphenyl]-4,4 '-diamines)) and the following formula NPD (N, the N '-dinaphthyl-N that represent, N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines), they are preferred.
Figure C0315330300261
There is no particular restriction to the thickness of hole moving layer, can select according to purpose.Thickness is 1 nanometer to 500 nanometer normally, more preferably 10 nanometer to 100 nanometers.
Hole moving layer can be made by the currently known methods that is fit to, and for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal to these methods, Langmuir-brodgett (LB) method, print process, transfer method or the like.
-hole blocking layer-
There is no particular restriction to hole blocking layer, can select according to purpose.Hole blocking layer preferably has the function that obstruct is injected from the anodal hole.
There is no particular restriction to the material of hole blocking layer, can suitably select according to purpose.
If aforementioned organic EL comprises hole blocking layer, then stopped by this hole blocking layer, and the electronics that transmits from negative pole is transported to the aforementioned light emission layer by this hole blocking layer from the hole that an anodal side transmits.Therefore, recombinate effectively in electronics and hole in this luminescent layer, recombinate in the organic thin film layer except that luminescent layer so can prevent hole and electronics.Thereby, effectively obtained as 1,3,6 of target luminescent material the light that the quaternary pyrene compound of 8-is sent.This is very favorable with regard to purity of color.
The hole blocking layer preferred arrangements is between luminescent layer and electron transfer layer.
There is no particular restriction to the thickness of hole blocking layer, can suitably select according to purpose.Normally about 1 nanometer to 500 nanometer of thickness, more preferably 10 nanometer to 50 nanometers.
Hole blocking layer can be a single layer structure, also can be multilayered structure.
Hole blocking layer can be made easily by currently known methods, and for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal to these methods, Langmuir-brodgett (LB) method, print process, transfer method or the like.
-electron transfer layer-
There is no particular restriction to electron transfer layer, can suitably select according to purpose.The example of electron transfer layer preferably has the layer that transmits the function of electronics from negative pole, or intercepts the layer that injects from the anodal hole.
There is no particular restriction to the material of electron transfer layer, can select according to purpose.Examples of materials comprises for example aforesaid aluminium quinoline of quinoline title complex (Alq) or analogue , oxadiazole derivative, triazole derivative, phenanthroline derivative perylene derivative, pyridine derivate, pyrimidine derivatives, quinoxaline derivatives, phenylbenzene quinone derivative, fluorene derivatives that nitro replaces or the like.If electronic migration layer material and luminescent layer material mixing and form film then can be made electronic migration and luminescent layer.If remix hole migration layer material and form film then can be made electronic migration and hole migration and luminescent layer.In this case, can use such as polymkeric substance such as Polyvinyl carbazole or polycarbonate.
Figure C0315330300281
Formula (12)
There is no particular restriction to the thickness of electron transfer layer, can suitably select according to purpose.Normally about 1 nanometer to 500 nanometer of thickness, preferred 10 nanometer to 50 nanometers.
Electron transfer layer can be a single layer structure, also can be multilayered structure.
In this case, preferably, the electronic migration material that is used for the electron transfer layer of contiguous luminescent layer has than 1,3,6, the light absorption wavelength border that the quaternary pyrene compound of 8-is shorter so makes the light-emitting zone that it limits in the organic EL be luminescent layer and prevent to produce from electron transfer layer undesirable luminous.Have than 1,3,6, the electronic migration examples of materials on the light absorption wavelength border that the quaternary pyrene compound of 8-is shorter comprises phenanthroline derivative, oxadiazole derivative and triazole derivative.Compound shown below is preferred example.
Figure C0315330300282
Formula (12)
Figure C0315330300291
2-(4-tert-butyl-phenyl)-5-(4-xenyl)-1,3, the 4-oxadiazole
Figure C0315330300292
3-phenyl-4-(1-naphthyl)-5-phenyl-1,2, the 4-triazole
Figure C0315330300293
3-(4-tert-butyl-phenyl)-4-phenyl-5-(4 '-xenyl)-1,2, the 4-triazole
Electron transfer layer can be made easily by currently known methods, and for example vapor deposition method, wet type become that embrane method, electronic beam method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), molecular layer are legal to these methods, Langmuir-brodgett (LB) method, print process, transfer method or the like.
-other layer-
Organic EL of the present invention can have other layer, can suitably select according to purpose.The example of other layer comprises protective layer or the like.
There is no particular restriction to aforementioned protective layer, can suitably select according to purpose.Preferred protective layer example is can prevent to impel molecule that organic EL worsens or material for example moisture and oxygen etc. infiltrate the layer of organic EL.
The example of aforementioned protective layer material comprises metal for example In, Sn, Pb, Au, Cu, Ag, Al, Ti and Ni, and metal oxide is MgO, SiO and SiO for example 2, Al 2O 3, GeO, NiO, CaO, BaO, Fe 2O 3, Y 2O 3And TiO 2, nitride is SiN and SiN for example xO y, metal fluoride is MgF for example 2, LiF, AlF 3, CaF 2, polyethylene, polypropylene, polymethylmethacrylate, polyimide, polyureas, tetrafluoroethylene, polychlorotrifluoroethylene, poly-dichloro difluoroethylene, the multipolymer of chlorotrifluoroethylene and dichloro difluoroethylene, by the multipolymer that the monomer mixture copolymerization that comprises tetrafluoroethylene and at least a comonomer is obtained, the fluorinated copolymer that has ring texture on copolymer chain, water-intake rate is less than or equal to 0.1% damp proof material more than or equal to 1% water-absorbing material and water-intake rate.
Protective layer can be made by the currently known methods that is fit to, and these methods for example vapor deposition method, wet type become embrane method, sputtering process, reaction sputtering process, molecular beam oriented growth method (MBE), ion beam method, ion plating, Plasma Polymerization (high frequency excitation ion plating), print process and transfer method.
There is no particular restriction to the structure of organic EL of the present invention, can select according to purpose.This structure example comprises following (1) to (13):
(1) positive pole/hole injection layer/hole moving layer/luminescent layer/electron transfer layer/electron injecting layer/negative pole, (2) positive pole/hole injection layer/hole moving layer/luminescent layer/electron transfer layer/negative pole, (3) positive pole/hole moving layer/luminescent layer/electron transfer layer/electron injecting layer/negative pole, (4) positive pole/hole moving layer/luminescent layer/electron transfer layer/negative pole, (5) positive pole/hole injection layer/hole moving layer/luminous and electron transfer layer/electron injecting layer/negative pole, (6) positive pole/hole injection layer/hole moving layer/luminous and electron transfer layer/negative pole, (7) positive pole/hole moving layer/luminous and electron transfer layer/electron injecting layer/negative pole, (8) positive pole/hole moving layer/luminous and electron transfer layer/negative pole, (9) positive pole/hole injection layer/hole migration and luminescent layer/electron transfer layer/electron injecting layer/negative pole, (10) positive pole/hole injection layer/hole migration and luminescent layer/electron transfer layer/negative pole, (11) positive pole/hole migration and luminescent layer/electron transfer layer/electron injecting layer/negative pole, (12) positive pole/hole migration and luminescent layer/electron transfer layer/negative pole, (13) positive pole/hole migration and luminous and electron transfer layer/negative pole, or the like.
When organic EL element had hole blocking layer, wherein (1) to plant this layer structure that is inserted with hole blocking layer between the luminescent layer of layer structure and the electron transfer layer to (13) also be suitable.
In these layers structure, (4) plants structure positive pole/hole moving layer/luminescent layer/electron transfer layer/negative pole is shown among Fig. 1.Organic EL 10 has the layer structure that comprises the positive pole 14 (for example ITO electrode), hole moving layer 16, luminescent layer 18, electron transfer layer 20 and the negative pole 22 (for example Al-Li electrode) that are formed on the substrate of glass 12, and each layer is according to this series arrangement in them.Anodal 14 (for example ITO electrodes) and negative pole 22 (for example Al-Li electrode) are connected to each other by power supply.Organic thin film layer 24 that can green light is formed by hole moving layer 16, luminescent layer 18 and electron transfer layer 20.
The peak luminous wavelength of organic EL of the present invention is preferably 490 nanometer to 540 nanometers.
Consider the luminous efficiency of organic EL of the present invention, its green light when being less than or equal to 10V voltage preferably, more preferably its green light when being less than or equal to 7V voltage, further preferred its green light when being less than or equal to 5V voltage.
Preferably, when using 10V voltage, light emission luminance of the present invention is 100cd/m 2Or bigger, more preferably it is 500cd/m 2Or bigger, further be preferably 1000cd/m 2Or it is bigger.
Organic EL of the present invention be particularly suitable for being used in various fields for example computer, be installed in the display equipment on the vehicle, outdoor display equipment, family expenses apparatus, full scale plant, home electronics, display equipment, clock display equipment, calendar date display equipment, window of tube and the voice machine relevant with traffic, and be particularly useful for OLED display of the present invention as described below.
<OLED display 〉
There is no particular restriction to OLED display of the present invention.OLED display of the present invention can also be selected from known structure except using organic EL of the present invention.
This OLED display can be the monochromatic type of green glow, polychrome type or panchromatic mode.
As Monthly Display (Japanese Techno Times Co.Ltd. publish) in September, 2000, the 33-37 page or leaf is disclosed, OLED display can be made the panchromatic mode indicating meter, that is to say, (a) three-colour light-emitting method, three types of organic ELs that wherein send three primary colors (blue (B), green (G) and red (R)) light respectively are distributed on the substrate; (b) white light method, wherein the white light that sends from the organic EL that emits white light is separated into three primary colors by colour filter; And (c) color conversion method, wherein the blue light that sends from the organic EL of blue light-emitting changes red (R) light and green (G) light into via the high-visibility pigment layer.In the present invention, because organic EL green light of the present invention, so can use three-colour light-emitting method and color conversion method, particularly suitable three-colour light-emitting method.
During by three-colour light-emitting manufactured panchromatic mode OLED display, except the organic EL of the present invention that is used for transmitting green light, the organic EL that also needs to be used for the organic EL of red-emitting and be used to launch blue light.
There is no particular restriction to the organic EL that is used for red-emitting, can be selected from the known element of prior art.Typical laminate structure is ITO (positive pole)/NPD/ DCJTB as follows 1% aluminium quinoline title complex (Alq)/Alq/Al-Li (negative pole).DCJTB is 4-dicyano methylene radical-6-cp-julolidine styryl (the julolidinostyryl)-2-tertiary butyl-4H-pyrans.Alq as previously mentioned.
4-dicyano methylene radical-6-cp-julolidine styryl (the julolidinostyryl)-2-tertiary butyl-4H-pyrans
There is no particular restriction to the organic EL that is used to launch blue light, can select from the known element of prior art.Suitable laminate structure example comprises ITO (positive pole)/NPD/DPVBi/Alq/Al-Li (negative pole).
There is no particular restriction to the concrete pattern of OLED display, can select according to purpose.The suitable example of concrete pattern is included in Nikkei Electronics (being published by NIkkei BusinessPublications Inc.of Japan), No.76 on March 13rd, 5,2000, disclosed passive matrix plate and active matrix board in the 55-62 page or leaf.
Aforementioned passive matrix plate for example has the band shape positive pole 14 (for example ITO electrode) that is arranged on the substrate of glass 12 parallel to each other as shown in Figure 2.On anode 14, be used for the band shape organic thin film layer 24 of transmitting green light, the organic thin film layer 28 that is used to launch the organic thin film layer 26 of blue light and be used for red-emitting is arranged in parallel successively and be substantially perpendicular to anodal 14.The negative pole 22 that has same shape on each organic thin film layer.
On aforementioned passive matrix plate, comprise a plurality of anodal 14 electrode lines 30 and comprise the negative line 32 of a plurality of negative poles 22, for example, make as shown in Figure 3 circuit thereby intersect at a right angle basically.Each is used for the point of crossing that the organic thin film layer 24,26 and 28 of transmitting green light, emission blue light and red-emitting is positioned in separately, bringing into play the effect of pixel, and a plurality of organic EL 34 is corresponding with each pixel.On this passive matrix plate, when applying electric current by any negative pole 22 in constant current power supply any in electrode line 30 anodal 14 and the negative line 32, electric current is applied on the organic EL thin film layer that is in the point of crossing, thereby will be luminous at organic EL thin film layer of this position.By controlling the light emission of each pixel cell, can easily form coloured image.
On active matrix board, for example, as shown in Figure 4, sweep trace, data line and supply lead are arranged in the lattice on the substrate of glass 12.Thereby the TFT circuit 40 that forms lattice that links to each other with sweep trace or the like is positioned in each grid, and the positive pole 14 (for example ITO electrode) that is placed in each grid can be driven by TFT circuit 40.On anode 14, be used for transmitting green light band shape organic thin film layer 24, be used to organic thin film layer 28 layout parallel to each other successively of launching the organic thin film layer 26 of blue light and being used for red-emitting.Negative pole 22 is also so arranged so that the organic thin film layer 28 that covers each organic thin film layer that is used for transmitting green light 24, is used to launch the organic thin film layer 26 of blue light and is used for red-emitting.Be used for the organic thin film layer 24 of transmitting green light, the organic thin film layer 28 that is used to launch the organic thin film layer 26 of blue light and be used for red-emitting all comprises hole moving layer 16, luminescent layer 18 and electron transfer layer 20 separately.
On aforementioned active matrix board, as shown in Figure 5, a plurality of sweep trace 46 layouts parallel to each other intersect at a right angle basically with a plurality of data lines 42 and a plurality of supply lead 44 parallel to each other, thereby the formation grid, thereby and switch TFT48 and driving mechanism TFT50 be connected to each grid and form circuit.If apply electric current, then can drive switch TFT48 and driving mechanism TFT50 for each grid from driving circuit 38.In each grid, the organic thin film device 24,26 and 28 that is used to launch blue light, transmitting green light and red-emitting plays the effect of pixel.In this active matrix board, if apply electric current one of to the data line 42 that sweep trace 46 that horizontal direction is arranged and vertical direction are arranged from driving circuit 38, the switch TFT48 that then is placed in the point of crossing is driven, the result has driven driving mechanism TFT50, so luminous by the electric current that comes from supply lead 44 at the organic EL 52 of this position.By controlling the light emission of this pixel cell, can easily form coloured image.
OLED display of the present invention can be advantageously used in various fields, for example computer, be installed in the display equipment on the vehicle, outdoor display equipment, family expenses apparatus, full scale plant, home electronics, display equipment, clock display equipment, calendar date display equipment, window of tube and the voice machine relevant with traffic.
Below, will describe specific embodiment of the present invention, but should not be construed as the present invention is subject to these embodiment.
(embodiment 1)
1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene synthetic
Based on Annalen der Chemie, the 531st volume, the method described in the 81st page, the reaction by pyrene and bromine synthesizes 1,3,6,8-tetrabromo pyrene.Make 1,3,6 then, 8-tetrabromo pyrene carries out the diaryl amination.As Tetrahedron Letters, the 39th rolls up described in the 2367th page (1998), according to implementing the diaryl amination by the ordinary method of the synthetic triarylamine of aryl halides.Particularly, 4 normal 3-methyldiphenyl base amine, 4 normal tert.-butoxy sodium, 0.1% normal acid chloride and 0.4% normal three (tertiary butyl) phosphines and 1,3,6,8-tetrabromo pyrene reacted 3 hours down in 130 ℃ in being used as the o-Xylol of solvent.After reaction was finished, cooled product washed the solution that is used to react with water several times, and distills o-Xylol.Remain oily matter with methanol wash, oily matter is carried out recrystallization and obtains crude reaction product with THF-methyl alcohol.By vacuum-sublimation purification crude reaction product, thereby obtain 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene is the compound of a kind of formula (1), wherein R 1To R 4Be the represented group of following formula:
Below list synthetic 1,3,6 thus, mass spectroscopy, ultimate analysis and the IR analytical results of 8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
<mass spectrum 〉
Use molecular formula C 68H 54N 4, and the nucleidic mass of carbon is 12, and the nucleidic mass of hydrogen is 1, and the nucleidic mass of nitrogen is 14, and the molecular weight that calculates is 926.
The molecular weight peak value is 926 and 927 in the mass spectrum.
<ultimate analysis 〉
Use molecular formula C 68H 54N 4
Calculated value: C:88.09%, H:5.87%, N:6.04%
Experimental value: C:88.40%, H:5.94%, N:6.12%
<IR analyzes 〉
Obtain institute's synthetic 1,3,6 by the KBr pressed disc method, the IR spectrum of 8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene, as shown in Figure 6.
(embodiment 2)
1,3,6,8-four [N-(1-naphthyl)-N-phenyl amino] pyrene synthetic
Method according to embodiment 1 synthesizes 1,3,6,8-four [N-(1-naphthyl)-N-phenyl amino] pyrene, but replace 3-methyldiphenyl base amine with (1-naphthyl)-N-phenyl amine.1,3,6,8-four [N-(1-naphthyl)-N-phenyl amino] pyrene is the compound of a kind of formula (1), wherein R 1To R 4Be the represented group of following formula:
Below list synthetic 1,3,6 thus, mass spectroscopy, ultimate analysis and the IR analytical results of 8-four [N-(1-naphthyl)-N-phenyl amino] pyrene.
<mass spectrum 〉
Use molecular formula C 80H 54N 4, and the nucleidic mass of carbon is 12, and the nucleidic mass of hydrogen is 1, and the nucleidic mass of nitrogen is 14, and the molecular weight that calculates is 1070.
The molecular weight peak value is at 1070 and 1071 places in the mass spectrum.
<ultimate analysis 〉
Use molecular formula C 80H 54N 4
Calculated value: C:89.69%, H:5.08%, N:5.23%
Experimental value: C:90.09%, H:5.28%, N:5.07%
<IR analyzes 〉
Obtain institute's synthetic 1,3,6 by the KBr pressed disc method, the IR spectrum of 8-four [N-(1-naphthyl)-N-phenyl amino] pyrene, as shown in Figure 7.
(embodiment 3)
1,3,6,8-four [4,4 '-two (α, α-Er Jiajibianji) diphenyl amino] pyrene synthetic
Method according to embodiment 1 synthesizes 1,3,6,8-four [4,4 '-two (α, α-Er Jiajibianji) diphenyl amino] pyrene, and just with 4,4 '-two (α, α-Er Jiajibianji) diphenylamine replaces 3-methyldiphenyl base amine.1,3,6,8-four [4,4 '-two (α, α-Er Jiajibianji) diphenyl amino] pyrene is the compound of a kind of formula (1), wherein R 1To R 4Be the represented group of following formula:
(embodiment 4)
The manufacturing of organic EL
Use embodiment 1 synthetic 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene is made the lamination-type organic EL as follows as the luminescent material of luminescent layer.Be formed with the ITO electrode on it and carry out ultrasonic cleaning, carry out the UV ozonize then as anodal substrate of glass water, acetone and Virahol.Adopt vacuum vapor deposition equipment (vacuum tightness=1 * 10 thereafter, -6Holder (1.3 * 10 -4Handkerchief), base reservoir temperature=room temperature), on the ITO electrode, apply N, N '-dinaphthyl-N, N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines (NPD) reaches the thickness of 50 nanometers, with it as hole moving layer.Next, at N, N '-dinaphthyl-N, N '-phenylbenzene-[1,1 '-biphenyl]-4, cover 1,3 by deposition on the hole moving layer that 4 '-diamines (NPD) constitutes, 6, the luminescent layer that 8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene constitutes reaches the thickness of 20 nanometers, covers as 2 of first electron transfer layer 9-dimethyl-4 by deposition on luminescent layer, 7-phenylbenzene-1,10-phenanthroline (BCP) reaches the thickness of 10 nanometers.Afterwards, on first electron transfer layer, covers the thickness that reaches 20 nanometers as the aluminium quinoline title complex (Alq) of second electron transfer layer, and on second electron transfer layer of aluminium quinoline title complex (Alq) formation, provide Al-Li alloy (Li content=0.5% quality) as negative pole and reach the thickness of 50 nanometers by gas deposition by deposition.Produce organic EL by this way.
If ITO electrode (positive pole) and Al-Li alloy (negative pole) in the organic EL of making thus apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and to observe luminosity when applying voltage for 10V be 1920cd/m 2The high color purity green emission.
(embodiment 5)
The manufacturing of organic EL
Method according to embodiment 4 is made organic EL, but by carrying out 1,3 simultaneously, 6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene and N, N '-dinaphthyl-N, N '-phenylbenzene-[1,1 '-biphenyl]-4, the gas deposition of 4 '-diamines (NPD) and form luminescent layer so makes per molecule (a mole) 1,3,6, the corresponding 99 molecule NPD (99 moles) of 8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and to observe luminosity when applying voltage for 10V be 2850cd/m 2The high color purity green emission.
(embodiment 6)
The manufacturing of organic EL
Method according to embodiment 5 is made organic EL, but with 4,4 '-two (9-carbazyl)-biphenyl (CBP) replace N, N '-dinaphthyl-N, and N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines (NPD) is as the material that is used for luminescent layer.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and to observe luminosity when applying voltage for 10V be 2600cd/m 2The high color purity green emission.
(embodiment 7)
The manufacturing of organic EL
Method according to embodiment 4 is made organic EL, but uses embodiment 2 synthetic 1,3,6, and 8-four [N-(1-naphthyl)-N-phenyl amino] pyrene replaces embodiment 1 synthetic 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and to observe luminosity when applying voltage for 10V be 2010cd/m 2The high color purity green emission.
(embodiment 8)
The manufacturing of organic EL
Method according to embodiment 5 is made organic EL, but uses embodiment 2 synthetic 1,3,6, and 8-four [N-(1-naphthyl)-N-phenyl amino] pyrene replaces embodiment 1 synthetic 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and to observe luminosity when applying voltage for 10V be 2900cd/m 2The high color purity green emission.
(embodiment 9)
The manufacturing of organic EL
Method according to embodiment 7 is made organic EL, but be to use 1,3,6,8-four [N-(1-naphthyl)-N-phenyl amino] pyrene forms hole migration and luminescent layer (thickness: 50 nanometers), rather than form hole moving layer and luminescent layer, and the thickness of first and second electron transfer layer increases by 10 nanometers separately, thus reach 20 nanometers and 30 nanometers respectively.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and the voltage that applies to observe luminosity during for 10V be 1800cd/m 2The high color purity green emission.
(embodiment 10)
The manufacturing of organic EL
Method according to embodiment 5 is made organic EL, but uses embodiment 3 synthetic 1,3,6,8-four [4,4 '-two (α, α-Er Jiajibianji) diphenyl amino] pyrene replaces embodiment 1 synthetic 1,3,6,8-four (N-(3-aminomethyl phenyl)-N-phenyl amino) pyrene.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and the voltage that applies to observe luminosity during for 10V be 3000cd/m 2The high color purity green emission.
(embodiment 11)
The manufacturing of organic EL
Method according to embodiment 5 is made organic EL, but replaces N, N '-dinaphthyl-N with aluminium quinoline title complex (Alq), N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines (NPD) is as the material of luminescent layer, and first electron transfer layer of omission BCP formation.
If ITO electrode (positive pole) in the organic EL of manufacturing and Al-Li alloy (negative pole) apply voltage, when 5V or the above voltage of 5V, in this organic EL, observe green emission, and the voltage that applies to observe luminosity during for 10V be 2620cd/m 2The high color purity green emission.
The invention solves the problem that correlation technique exists, and provide 1,3,6, the quaternary pyrene compound of 8-is as the material of transmitting green light in the organic EL, provide have excellent luminous efficiency, the organic EL of luminosity and green light color purity and use the high-performance OLED display of this organic EL.

Claims (16)

1. organic EL comprises:
Organic thin film layer between positive pole and the negative pole, this organic thin film layer comprise and contain shown in the following formula (1) 1,3,6, and the quaternary pyrene compound of 8-is as the luminescent layer of luminescent material:
Formula (1)
R wherein 1To R 4Can be identical or different, and representative is selected from a group in following formula (3)-(5):
Formula (3)
R wherein 7And R 8Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Figure C031533030002C3
Formula (4)
R wherein 9, R 10And R 11Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Figure C031533030003C1
Formula (5)
R wherein 12, R 13, R 14And R 15Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer.
2. organic EL according to claim 1 is characterized in that described luminescent layer is luminous and electron transfer layer.
3. organic EL according to claim 1 is characterized in that described organic thin film layer also comprises hole moving layer and electron transfer layer.
4. organic EL according to claim 3 is characterized in that, described luminescent layer is by 1,3,6 shown in the formula (1), and the quaternary pyrene compound of 8-constitutes.
5. organic EL according to claim 3 is characterized in that, described luminescent layer comprises the aromatic amine derivative shown in the following formula (6):
Figure C031533030003C2
Formula (6)
Wherein " n " is 2 or 3, and " Ar " representative is selected from divalence aromatic group, trivalent aromatic group, divalence heterocyclic aromatic group and trivalent heterocyclic aromatic group, and R 16And R 17Can be identical or different, a kind of in expression monovalent aromatic family's group and the heterocyclic aromatic group.
6. according to the described organic EL of claim 5, it is characterized in that described aromatic amine derivative is selected from the N shown in the following formula (7), N '-dinaphthyl-N, N '-phenylbenzene-[1,1 '-biphenyl]-4,4 '-diamines, i.e. NPD:
Formula (7).
7. organic EL according to claim 3 is characterized in that, described luminescent layer comprises the represented carbazole derivative of following formula (8):
Formula (8)
Wherein " Ar " expression is selected from the divalent group, the trivalent group that has aromatic ring that have aromatic ring, has the divalent group of heterocycle aromatic ring and has the trivalent group of heterocycle aromatic ring; R 18And R 19The independent separately hydrogen atom of representing; And " n " is integer 2 or 3.
8. organic EL according to claim 7 is characterized in that, described carbazole derivative is selected from 4,4 ' shown in the following formula (9)-two (9-carbazyl)-biphenyl, i.e. CBP:
Formula (9).
9. organic EL according to claim 3 is characterized in that, described luminescent layer comprises the oxine title complex shown in the following formula (10):
Figure C031533030005C1
Formula (10)
Wherein " M " represents atoms metal and R 20The expression hydrogen atom.
10. organic EL according to claim 9 is characterized in that, described oxine title complex is the aluminium quinoline title complex shown in the following formula (11), i.e. Alq:
Formula (11).
11. organic EL according to claim 3 is characterized in that, described electron transfer layer comprises 2 shown in the following formula (12), 9-dimethyl-4, and 7-phenylbenzene-1, the 10-phenanthroline, promptly BCP is as the electronic migration material:
Figure C031533030005C3
Formula (12).
12. organic EL according to claim 1 is characterized in that, described organic EL transmitting green light.
13. 1,3,6 shown in the following formula (1), the quaternary pyrene compound of 8-are as the application of luminescent material:
Figure C031533030006C1
Formula (1)
R wherein 1To R 4Can be identical or different, and representative is selected from a group in following formula (3)-(5):
Figure C031533030006C2
Formula (3)
R wherein 7And R 8Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Formula (4)
R wherein 9, R 10And R 11Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Figure C031533030007C1
Formula (5)
R wherein 12, R 13, R 14And R 15Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer.
14. application according to claim 13 is characterized in that, described luminescent material is the luminescent material in the organic EL.
15. an OLED display comprises organic EL, wherein this organic EL comprises:
Organic thin film layer between positive pole and the negative pole, this organic thin film layer comprise and contain shown in the following formula (1) 1,3,6, and the quaternary pyrene compound of 8-is as the luminescent layer of luminescent material:
Figure C031533030007C2
Formula (1)
R wherein 1To R 4Can be identical or different, and representative is selected from a group in following formula (3)-(5):
Figure C031533030007C3
Formula (3)
R wherein 7And R 8Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Figure C031533030008C1
Formula (4)
R wherein 9, R 10And R 11Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer;
Figure C031533030008C2
Formula (5)
R wherein 12, R 13, R 14And R 15Can be identical or different, and represent a hydrogen atom or an alkyl group respectively, letter " n " expression 1 or greater than 1 integer.
16. OLED display according to claim 15 is characterized in that, described organic display is a kind of in passive matrix plate and the active matrix board.
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